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Replacement Controller

I have a Richdel 446PR six zone controller and would like to replace it with something that has more programming flexibility. The Richdel is an indoor unit with a transformer output of 24V 1A. The Rain Bird RZX6I six station ESP-RZX timer seems like it would do the trick but I noticed its transformer is rated for 24V 650mA. Is the transformer amperage difference anything to worry about or will 650mA be enough to power my valves?